Engine stall and backfire

My 350 vortec 1992 starts up on, idles rough on all 8 cylinders but when I try to drive off or rev it up, it will pop through the tbi, but if I put my foot in it hard, it revs . When I try to drive of normal it with pop, , sputter, and start to blow black smoke (loading up). But if I but! For in it hard it will break the rear wheels lose and fun beautiful until I ease , than runs rough. New cap, rotor, plugs, wires. Any ideas? Any advice will be appreciated. Thank you!

i have a '90 chevy c1500 short wheel base and my uncle has a '91 c1500 extended cab both have same engine. is there any difference in the computer? we are gonna swap trucks but want to keep our engine...

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